Okay - for free, have a look at:
http://www.racenet.com.au
Covers Sydney races (and some Queensland races). Unfortunately, the other states haven't really woken up yet!
A reasonably cheap (about $200 per year in your terms) serive that provides ALL start form for horses in EVERY race in Oz EVERY day (online service, not download) is:
http://www.racequest.com
Always have a look at:
http://www.practicalpunting.com.au
for Aussie news etc
....there's more, but it makes me realise that you can't get a lot of free form here. Still, at least the racenet site gives you free 5 start form for the Sydney races (which I think you guys get).
Hope this helps,
Aussieplayer
PS. If you want more sites that you have to pay for downloads or whatever, let me know and I'll put a few of those up. Racequest is quite reasonable though.